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We occasionally get a bug report from users that some assembly code (often in runtime or crypto or compression) causes a SIGILL.
We should run builders (perhaps in qemu?) simulating older processors so we can exercise all the assembly fallback paths and CPU detection code.
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As a starting build, @saljam made a qemu builder in the past:
Using it as a model, an x86-on-x86 builder would be interesting, masking away certain CPU features.
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This would also be helpful for a theoretical future RISC-V builder.
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